聚能切割销毁废旧炮弹

根据本次要销毁的炮弹壁较厚等特点,经方案对比与论证,选用了线性聚能切割器对其进行爆炸销毁。本文介绍了线性聚能切割器参数设计的依据,切割器外形、药型罩以及炸药种类的选择,零炸高的实现,以及起爆网路、安全警戒及安全距离的计算;同时,阐述了利用聚能切割技术销毁废旧炮弹的效果和体会。     

有风条件下末制导炮弹弹道模型研究

 风的存在改变了末制导炮弹与空气的相对运动速度,导致末制导炮弹空气阻力和空气阻力加速度发生变化,与此有关的力和力矩也发生相应的变化.为了分析风的存在对末制导炮弹运动特性的影响特点,必须建立相应的弹道模型.在末制导炮弹标准弹道模型的基础上,主要考虑纵风、横风的存在,引入了相对弹道坐标系、相对速度、相对攻角、相对侧滑角的概念,分析力和力矩的投影,建立了有风条件下的末制导炮弹弹道模型.通过仿真分析,得出风对末制导炮弹的弹道影响规律,为末制导炮弹的弹道特性研究奠定基础.     

晶体管开关参数标准装置测试夹具的设计

晶体管开关参数标准装置主要用于测量双极型中小功率晶体开关管的时间参数,如开启时间ton和关闭时间toff等.本文介绍了晶体管开关参数测量的基本电路、参数计算及标准装置中测试夹具在电路设计和结构设计上的特点.     

双目立体视觉的远距离运动物体运行姿态研究

提出了一种采用双目立体视觉测量技术来获得炮弹运行姿态的新方法.首先利用加权平均的方法求炮弹的质心,然后利用炮弹表面点到弹轴的距离相等的原理,用最小二乘拟合法推导出弹轴方程,得到弹轴矢量,最后通过建立弹轴矢量与姿态角之间的数学关系得到炮弹运行时的姿态角.仿真实验结果表明,该测量方法具有较高的精度,能满足远距离运动物体运动参数的测量要求.     

一次爆炸法销毁废旧炮弹的设计及组织实施

辽宁省本溪市截止到2006年6月底收缴了各种类型的废旧炮弹、炸弹、爆破筒、地雷、手雷、手榴弹、子弹等总重量达10t。为了彻底清除隐患,公安机关组织实施了该市规模空前的废旧炮（航）弹的销毁。根据这次被销毁的废旧弹的特点,选择了爆炸法。介绍了炮弹运输过程中的注意事项,并按工程爆破设计思路,阐述了销毁场地和诱爆药的选择、爆破参数选取,以及此次销毁工作的施工组织及安全措施,经过精心操作,圆满成功。     

液体流量标准装置变温系统设计

介绍了液体流量标准装置的特点、发展方向及主要技术要求;分析了温度变化情况及影响因素。对变温系统方案进行比较分析,选出了电加热及制冷机组的变温方案、水换热的恒温方案;设计了并联式复合结构的变温系统结构;总结了不同变温方案参数计算方法;运用实例对设计方案、方法进行了验证。     

两种电阻应变计参数检测装置的比较与分析

目前电阻应变计参数的测量装置主要分为悬臂梁式和纯弯矩梁式两种.针对基于等截面悬臂粱及等强度悬臂梁的电阻应变计参数检测装置的优缺点进行了理论分析,同时详细介绍并分析了基于纯弯矩梁的电阻应变计参数检测装置的技术特点,该装置相对展伸不确定度U,可达0.1%,范围因子K=3.实践证明,纯弯矩梁式检测装置较悬臂梁式可以实现电阻应变计参数的高精度检测,有效地克服悬臂梁式装置存在的缺陷,有一定的推广价值.     

高g值加速度冲击试验技术研究

摘 要：根据弹体高速侵彻硬目标过程中加速度测试的特点,研制了高g值冲击试验装置。它由一级空气炮、加速度存储测试装置、炮弹、反射式激光测速仪和激光多普勒测速仪等组成,并在该冲击试验装置上进行了弹载加速度存储测试装置的高g值冲击试验。采用泡沫铝缓冲件对记录电路模块进行缓冲保护,利用光栅作为合作目标,由两套激光多普勒测速仪同时记录冲击过程中测试装置外壳和电路模块的激光频移信号, 处理可得到二者的加速度——时间曲线,比较了泡沫铝的高g值缓冲效果。     

空调用湿式热回收装置的热工性能研究

基于计算流体力学仿真(CFD)方法,针对空调用湿式热回收装置的热质交换特点,建立了空气通道内三维层流流动和传热、传质耦合过程的数学物理模型,探讨了空调用湿式热回收装置空气通道内温度、浓度及压力等参数的分布状况,应用焓效率分析方法对其换热性能进行了评价.结果表明:空调用湿式热回收装置的结构参数对其换热性能及阻力性能有重要影响.该研究对空调用湿式热回收装置的优化设计有一定的参考价值.     

水下爆炸法销毁废旧炮弹技术研究

根据废旧炮弹具有稳定性差、危险性大、运输储存难度大等特点。结合南宁市公安部门待处置及销毁的废旧炮弹种类、数量、外观锈蚀等状况,提出了水下爆炸法,并制定了销毁方案。在完成弹药种类的甄别、销毁场地的选择后,对废旧炮弹当量和爆破器材消耗量进行了计算,并提出销毁时的安全防护原则,计算了爆破振动速度,以达到预防爆破振动危害的目的。本次炮弹销毁取得了较好的效果,有效地消除其带来的安全隐患,确保了社会治安稳定、人民安全,可为同类工程提供参考。     

Stress analysis of a strip with a step and a crack

Stress analysis for a strip of which widths are different at the right and left handsides is carried out for before and after occurrence of a crack at a corner of a step. The strip is analyzed as a thin plate bending problem subject to transverse bending and torsion, and as a plane eleastic problem subject to bending in the plane and uniaxial tension. The rational mapping function of a sum of fractional expressions and complex variable method are used. Stress distribution and stress intensity factors are obtained.     

Calculation of a transient in a two-pole network with a thermistor

An analytical expression is derived which describes the variation of the thermistor temperature during a relay-effect transient process following an instantaneous change in the supply voltage in an R — R_T two-pole network.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 38, No. 3, pp. 465–472, March, 1980.     

Interaction between a liquid and a cylindrical body touching a wall

An exact solution is obtained for the problem of interaction between the ideal liquid homogeneously moving at infinity and streamlining a round cylinder touching a solid wall.     

Influence lines for bending under a ring load of a free shell,a shell embedded in a soft medium and a shell containing a soft core

Summary Theoretical expressions for stresses and displacements have been derived for bending under a ring load of a free shell, a shell embedded in a soft medium, and a shell containing a soft core. Numerical work has been done for typical cases with anElliot 803 Digital Computer and influence lines are drawn therefrom.

---

Einflußlinien für die Biegung einer freien Schale, einer Schale in einer weichen Bettung und einer Schale mit weichem Kern

Zusammenfassung Für die Biegung einer freien Schale, einer weich gebetteten Schale und einer Schale mit weichem Kern unter einer Ringlast werden Ausdrücke für die Spannungen und Verschiebungen hergeleitet. Die Ergebnisse wurden für einige typische Fälle mit einem DigitalrechnerElliot 803 numerisch ausgewertet. Die sich ergebenden Einflußlinien wurden graphisch dargestellt.

---

Nomenclature A (),B () Functions of - a, t Mean radius and thickness of the shell - E _S , _S Young's modulus andPoisson's ratio of the shell - G _c , _c Shear modulus andPoisson's ratio of the casting or core - I ₀ (r),I ₁ (r) ModifiedBessel functions of the first kind and order zero and one respectively - K ₀ (r),K ₁ (r) ModifiedBessel functions of the second kind and order zero and one respectively - p Ring load, lb/in - U, W Displacement components in the casing or core in thez andr direction - u, w Displacement components of a middle surface point in the shell - _r , _rz Radial and shearing stress components - Independent variable of infinite integrals - k [3(1–S ²)a ²/t ²]^1/4 With 13 Figures     

Imaging a point to a line with a single spherical mirror

Methods for imaging a single point source to a line image are discussed, and a design study of single spherical mirror systems that form aberration-free line images is presented. An expression forthe ray density along the line image is derived for such systems in the cases of (i) uniform beam profiles and (ii) Gaussian beam profiles. The resulting ray density profiles are illustrated for single spherical mirror systems over a wide range of design parameters.     

Piercing a metallic barrier with a jet of a dilute polymer solution

Results are shown pertaining to the action of jets of dilute polymer solutions on solid barriers. The piercing of a barrier is explained by the viscoelastic properties of aggregates which, during an impact, behave like solid particles.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 25, No. 6, pp. 1090–1094, December, 1973.     

Linear heat transfer in a flow around a cylinder or a sphere

It is shown that the relation between the Nusselt and Reynolds numbers determined by the Reynolds analogy is linear with self-similarity of the hydrodynamic resistance coefficient.Special Design and Technology Office Element, Odessa, Ukraine. translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 68, No. 3, May–June, pp. 395–396, 1995.     

Interaction between a cylindrical shell in a fluid and a pulsating bubble

The dynamic behavior of a cylindrical fluid-immersed shell in a pressure wave initiated by a pulsating vapor-gas bubble that develops as a result of the action of laser radiation on the absorbing medium (metal) is examined experimentally and theoretically. The results of the experiments suggest that the amplitude of the shock wave that develops as a result of complete or partial vaporization of the absorbing medium is appreciably smaller than the amplitude of the waves due to pulsations of the bubble that is formed. Experimental data on the pattern of structural deformation are confirmed by calculations. The effect of load simulation on the behavior of the shell is established according to computational data.Translated from Problemy Prochnosti, No. 6, pp. 116–120, June, 1990.